Compose MIME independently of SMTP - #74
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Add @upyo/mime so applications can archive messages or hand composed bytes to SMTP and JMAP raw delivery without configuring an SMTP connection. Share the serializer and DKIM implementation with SMTP while preserving its envelope, delivery-status, size checks, and replay-error behavior. Keep unsigned attachments lazy and provide independent, cancellable readers. Support buffered and replay-checked streaming DKIM with portable hashing, and correct quoted-printable and MIME header line handling. Verify native runtimes and workerd without Node compatibility, with independent MIME parsing and signature checks. Closes #68 Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-fable-5-1
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe pull request adds Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🔵 Low · up to This change adds portable MIME composition, DKIM signing, and SMTP/JMAP raw-message integration. The remaining risk is limited to release metadata workflow alignment and dependency compatibility for portable hashing; these should be confirmed before release. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 71.88% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 32 functions across 36 files. (4 skipped: 4 unsupported.)
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #74 +/- ##
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- Coverage 81.72% 81.67% -0.05%
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Files 35 39 +4
Lines 5356 5485 +129
Branches 1134 1158 +24
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+ Hits 4377 4480 +103
- Misses 750 757 +7
- Partials 229 248 +19 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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In @.github/workflows/main.yaml:
- Line 12: Update the actions/checkout@v4 step in the edge-test workflow to set
persist-credentials to false, while preserving the existing checkout behavior.
In `@CHANGES.md`:
- Around line 234-238: Remove the duplicated MIME composition release-note entry
from the unreleased section of CHANGES.md, leaving the existing
changes.d/mime/mime-composition.md entry as the sole source.
In `@packages/mime/edge/runner.mjs`:
- Line 22: Update the entryPoints configuration to convert the worker URL with
fileURLToPath instead of reading URL.pathname, ensuring percent-encoded spaces,
non-ASCII characters, and Windows paths resolve correctly; import or reuse the
appropriate fileURLToPath utility in the runner module.
In `@packages/mime/src/dkim/body-hash.ts`:
- Line 1: Update the sha256 import in body-hash.ts and the corresponding
`@noble/hashes` mapping in deno.json to use the exported `@noble/hashes/sha2.js`
subpath, preserving the existing sha256 usage.
In `@packages/mime/src/message.ts`:
- Around line 562-571: Validate both composed header inputs in
packages/mime/src/message.ts: update encodeAddress to reject CR or LF in
address.address before interpolation, and update the custom-header path around
lines 196-200 to reject keys that are not valid RFC 5322 field-name values
before foldHeader. Preserve existing handling for valid addresses and header
keys.
In `@packages/smtp/package.json`:
- Around line 66-67: Add an imports field to the smtp Deno configuration,
mapping `@upyo/mime` and `@upyo/mime/internal` to the corresponding package exports,
so both specifiers used by the smtp source resolve during the JSR build.
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⛔ Files ignored due to path filters (2)
deno.lockis excluded by!**/*.lockpnpm-lock.yamlis excluded by!**/pnpm-lock.yaml
📒 Files selected for processing (57)
.github/workflows/main.yamlAGENTS.mdCHANGES.mdREADME.mdchanges.d/mime/mime-composition.mdchanges.d/smtp/mime-line-encoding.mdchanges.d/smtp/smtputf8.mddocs/.vitepress/config.mtsdocs/messages/compose.mddocs/messages/mime.mddocs/package.jsondocs/transports/jmap.mddocs/transports/smtp.mdmise.tomlpackages/jmap/mise.tomlpackages/jmap/package.jsonpackages/jmap/src/raw-message.integration.test.tspackages/mime/README.mdpackages/mime/deno.jsonpackages/mime/edge/runner.mjspackages/mime/edge/worker.tspackages/mime/mise.tomlpackages/mime/package.jsonpackages/mime/src/bytes.tspackages/mime/src/cancellation.test.tspackages/mime/src/compose.test.tspackages/mime/src/dkim/body-hash.test.tspackages/mime/src/dkim/body-hash.tspackages/mime/src/dkim/canonicalize.test.tspackages/mime/src/dkim/canonicalize.tspackages/mime/src/dkim/index.tspackages/mime/src/dkim/sign.test.tspackages/mime/src/dkim/sign.tspackages/mime/src/dkim/types.tspackages/mime/src/index.tspackages/mime/src/internal.tspackages/mime/src/message.tspackages/mime/src/mime-stream.test.tspackages/mime/src/mime-stream.tspackages/mime/src/stream.tspackages/mime/src/test-utils/dkim-test-keys.tspackages/mime/src/test-utils/verify-dkim.tspackages/mime/tsdown.config.tspackages/smtp/mise.tomlpackages/smtp/package.jsonpackages/smtp/src/config.tspackages/smtp/src/index.tspackages/smtp/src/message-converter.tspackages/smtp/src/message-stream.test.tspackages/smtp/src/message-stream.tspackages/smtp/src/mime-regression.test.tspackages/smtp/src/raw-message.integration.test.tspackages/smtp/src/smtp-connection.tspackages/smtp/src/smtp-transport.dkim.mailpit.test.tspackages/smtp/src/smtp-transport.dkim.test.tspackages/smtp/src/smtp-transport.tspnpm-workspace.yaml
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The edge test job only needs a checkout to build and run its tests. Keep the checkout token out of Git configuration during those steps. #74 (comment) Assisted-by: Codex:gpt-6-astra
Decode the worker file URL before passing it to esbuild so checkout paths containing spaces or Unicode characters remain usable. Verify the runner in a path containing both spaces and Korean text. #74 (comment) Assisted-by: Codex:gpt-6-astra
Callers can construct Message values without createMessage(), so the shared serializer must reject address line breaks and invalid custom field names before emitting headers. Keep the full RFC 5322 field-name range rather than restricting it to HTTP header tokens. Add regression tests for the shared SMTP preparation path and public MIME composition API, including CRLF injection and valid punctuation. #74 (comment) Assisted-by: Codex:gpt-6-astra
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Extract SMTP's MIME serializer and DKIM signer into @upyo/mime so applications can compose .eml files without SMTP configuration. SMTP shares the same implementation, and composed messages work with SMTP/JMAP
sendRaw().Web APIs and portable hashing support edge runtimes without Node compatibility. Unsigned attachments stay lazy; streaming DKIM checks replayed bytes to avoid buffering the body. Quoted-printable and header line-limit fixes make the output suitable for raw delivery.
Validated on Deno, Node.js, Bun, and workerd, including independent MIME parsing and signature verification. Repository checks and documentation builds pass.
Closes #68.